Modern Physics 3 Question 43

42. A uranium nucleus (atomic number 92 , mass number 238) emits an alpha particle and the resulting nucleus emits β-particle. What are the atomic number and mass number of the final nucleus?

(1982,2M)

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Answer:

Correct Answer: 42. (a) 91 (b) 234

Solution:

  1. 92U238α-decay 90X234β - decay 91Y234

During an α-decay atomic number decreases by 2 and mass number by 4 . During a β-decay, atomic number increases by 1 while mass number remains unchanged.



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